AKM AK4688集成2路ADC及DCA的24位立体声音频CODEC设计方案

AKM公司的AK4688是一款立体声音频CODEC。内嵌支持异步操作的24位ADC和DAC输入/输出数据接口，通过外部电阻调节预放大器的输入范围来支持线路输入。内部集成一个电荷泵，通过3.3V单电源供电，获得一个对地2Vrms电源，以减少外部交流耦合电容及抑制电路。AK4688芯片ADC部分动态范围为99dB，DAC部分动态范围为105dB。设计方案不仅介绍了AK4688芯片ADC及DCA的特性，而且还介绍了该芯片的异步操作特性。同时，本方案提供了一个S/PDIF接口以方便连接数字音频设备。本文详细介绍了AK4688的主要特性、内部框图、应用框图以及采用AK4688芯片设计的评估开发板电路原理图及PCB Layout图。

The AK4688 is a stereo audio CODEC. The integrated ADC and DAC interfaces accept up to 24-bit input/output data and support an asynchronous operation. The input range of the pre-amplifier, that supports line inputs, is adjustable by an external resistor. A ground referenced 2Vrms output with a 3.3V single power supply is achieved by an integrated charge pump, reducing external parts such as AC-coupling capacitors and mute circuits. The ADC block of the AK4688 achieves a dynamic range of 99dB, and the DAC block achieves a dynamic range of 105dB. The AK4688 is suitable for digital recording systems, digital TVs, Blu-ray recorders and Home theater systems.

AK4688主要特性

􀂆Asynchronous ADC/DAC Operation

􀂆Capless Stereo Pre-amplifier for Line Input/Output

􀂆24bit Stereo ADC

- 64x Oversampling
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